Prices also depend on timing of buying tickets. I’ve found that if a ticket is $100 when put up for sale in Jan or Feb:
1. The price gradually dips, reaching it’s lowest point in June/July at about $70-$80.
2. In August, with the anticipation of the season picking up, prices will return to near original value.
3. But like buying very last minute airfare, tickets can drop up to half ($50) the day or two before, depending on availability of course.
4. In season ticket prices take on their own life, dropping or rising depending on the success or failure of a season. Back when Notre Dame went 4-8 in 2016 I bought $200 seats for only $75 for a November home game Vs Virginia Tech.